BRUSSELS — There are military trucks parked in Molenbeek, and soldiers with submachine guns patrol the jittery streets of the Brussels district that has been the epicenter of European terrorism in recent months.

It’s one of the most-talked-about subplots of the 2016 presidential campaign Donald Trump’s rhetorical blitzkrieg against Fox News Channelstar Megyn Kelly is one of the most-talked-about subplots of the 2016 presidential campaign.